New process for the treatment of polluted water using the coupling of nanoparticles (Fe3O4) and intense magnetic system

• Published in: Emergent materials (Online) 2024-06, Vol.7 (3), p.947-957
• Main Authors: Tlili, Hajer, Elaoud, Anis, Asses, Nedra, Horchani-Naifer, Karima, Ferhi, Mounir
• Format: Article
• Language: English
• Subjects: Chemistry and Materials Science; Energy Materials; Materials Engineering; Materials Science; Original Article
• ISSN: 2522-5731; 2522-574X
• DOI: 10.1007/s42247-023-00619-4

This study presents an innovative approach to reducing oxidizable pollutants in contaminated water by using magnetite Fe 3 O 4 nanoparticles (MNPs) in conjunction with a high-intensity magnetic field. The MNPs used as adsorbents were synthesized by co-precipitation method and analyzed by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), surface area analysis (BET), and thermogravimetric analysis (TGA). The performance on the reduction efficiency of the contaminated water was investigated under different conditions: pH (4–9), adsorbent masses (0.5–1.5 g/L), contact times (15–90 min), and stirring rates (50–300 rpm). The nanoparticles produced by co-precipitation showed a smaller size than the other techniques (10 nm). The optimum results of the treatment with magnetite indicate the reduction conditions: contact time of 50 min, pH of 8, mass of magnetite of 1 g/L, and stirring speed of 200 rpm. Using the coupling of nanoparticles and an intense magnetic field (1T) generates better treatments up to 84% COD and 85% BOD 5 . These results highlight the potential of this method for advanced environmental applications, offering a new way to treat polluted water. Graphical abstract Coupling MNPs-magnetic field for water treatment.